Working principle of engine rocker shaft:
One end is raised or lowered (either directly or through gear follower (lifter) and putter) by the CAM shaft's rotating blade, and the other end is applied to the stem. When the camshaft blade raises the outside lever arm, the internal force is applied to the stem to open the action valve. When the outer boom is allowed to return due to the camshaft, the inner boom rises, allowing the valve spring to compress and close the action valve.
The drive CAM works by driving the camshaft. It can push the rocker arm up and down near the barrel shaft or shaft. In this way, the driving CAM can be worn at the point of contact with the stem through the action of the CAM roller follower. At the same time through another CAM roller from the action of the moving parts to the second rocker arm to do similar movements. This rotates the rocker shaft and transfers the action to the lift valve through the gear follower. In this case, the inlet valve is opened, causing the gas to rush towards the cylinder cover.